Today in 1945 Truman signed the U.N. Charter.

On this day in 1945, the United States joined the new United Nations when President Truman signed the U.N. Charter.
National Archives: Our Presidents

United Nations Charter

The Signing of the U.N. Charter (Youtube)

U.N. Charter

Today in 1945, the Enola Gay dropped an atomic bomb on Hiroshima

At 8:16 a.m. (local time) on August 6 1945, a B-29 bomber, the Enola Gay dropped an atomic bomb on Hiroshima, Japan.

Wikipedia: Atomic bombings of Hiroshima and Nagasaki

Hiroshima Nuclear (atomic) Bomb - USA attack on Japan (1945)